Rails迁移:删除表和更改引用

Question

请帮我为下一个需求创建一个正确的迁移

• 放置表"hiring_question_groups“
• 将"hiring_questions“中的引用(：组)更改为引用(：company)

我以前也有过这样的迁移：

class CreateHiringQuestionsAndGroups < ActiveRecord::Migration
  def change
    create_table :hiring_questions do |t|
      t.references :group
      t.string :title
      t.text :description
      t.boolean :is_active, default: true
      t.timestamps
    end

    create_table :hiring_question_groups do |t|
      t.references :company
      t.string :title
      t.boolean :is_active, default: true
      t.timestamps
    end
  end
end

应删除的表格：

class Hiring::QuestionGroup < ActiveRecord::Base
  belongs_to :company
  has_many :questions, class_name: 'Hiring::Question', dependent: :destroy, foreign_key: 'group_id'

应更改此表：

class Hiring::Question < ActiveRecord::Base
  belongs_to :group, class_name: 'Hiring::QuestionGroup'

至：

class Hiring::Question < ActiveRecord::Base
  belongs_to :company, class_name: ???

我如何通过一次迁移就可以做到这一点？

Answer 1

这很简单！

def change
    remove_reference :hiring_questions, :group    
    drop_table :hiring_question_groups
    add_reference :hiring_questions, :company
end

对不起！)